Impeller



Oct. 26, 1954 J J ov cs 2,692,563

IMPELLER Filed July 12, 1949 INVNTO 5y ay V J. Kai/4 CS ATTOQNEYS Patented Oct. 26, 1954 UNITED STATE'S'PATENT OFFICE IMPELLER John J. Kovacs, New York, N. Y.

Application July 12, 1949, Serial No. 104,351

1 Claim. 1

This invention relates to an impeller or rotating blade for water systems and to a method for making the same.

In conducting water from the street mains to the tops of buildings, it frequently becomes necessary to introduce into the water system of the buildings some means to force the Water to the top of the buildings. Known impellers are objectionable either because of the number of parts required in their construction or because of their weight.

It is an object of the instant invention to simplify the construction of impellers of the type described.

A further object is to decrease the cost of construction of water impellers.

Another object is to provide an impeller of such light weight and efficient design as to decrease the cost of operation.

Other objects of the instant invention will become apparent in the course of the following specification.

In the accomplishment of these objectives, the improved water impeller is formed in part from a thin disc of any desired diameter and any suitable material. Around the periphery of the disc are radially directed spaced slots while spaced from the inner end of each slot is a coacting circular opening. For each slot and coacting opening, a blade is formed. Each blade is constituted of a fiat body in one edge of which a slit is formed, the slit dividing the body into two substantially equal parts. The outer end of the slit is constricted relative to the inner end and coacts with the circular opening when the inner portion of the slit is fitted over the surface of the disc intermediate the inner end of the slot and the coacting circular opening. When the slitted halves of the blade are pressed together, the parts of the blade adjacent the constricted outer portion are locked into the circular opening with the edge of the blade opposite the slit flush with the periphery of the disc. During the pressing operation, the plane of the blade has a tendency to form other than a right angle with the plane of the disc but by forming a concentric circular protrusion in the disc adjacent the inner ends of the blades, the plane of each blade can always be made to form a substantial right angle with the plane of the disc. A central opening is formed in the disc and internally threaded for attachment to the shaft of a prime mover.

The invention will appear more clearly when taken in conjunction with the accompanying drawings, showing by way of example a preferred embodiment of the improved impeller.

In the drawings:

Figure 1 is a plan view of the impeller constructed in accordance with the principles of this invention.

Figure 2 is a sectional view along the line 2-2 of Figure l, and enlarged.

Figure 3 is a plan view of the impeller blank.

Figure 4 is a plan view of the impeller blade.

Referring now in greater detail to the drawings where like reference numerals indicate like parts, reference numeral I0 indicates the improved impeller.

The impeller 10 is constituted of the disc II (Fig. 3) and the blade I2 of brass, plastic, or other suitable material. The disc may be of any size desired with the center I3 extruded and internally threaded for attachment to the shaft of the prime mover (not shown) and, of course, could be merely an internally threaded circular opening if desired.

Around the periphery of the disc II are the spaced and radially directed slots I4 which have substantially equal depth and a width approximately equal to the thickness of the later described blades I2 which are fitted therein. Equally spaced from the inner end of each slot is a coacting circular opening I5, the center of which is on a. radius 23 of the disc which substantially bisects the slot, the coacting slot and opening providing a means for attaching the blades to the disc as later shown.

The blades I2 may have an outer periphery of any desired shape as long as adapted to the impeller housing which is not shown. In one edge I8 of each blade I2 is a slit I6 which coacts with the previously mentioned slot and circular opening and substantially divides the blade into two equal parts. The depth of each slit I6 between the points I9 and 2!] (Fig. 4) is equal to the distance between the point 2I (Fig. 3), that is the inner end of the slot I4, and the point 22 on the circumference of the circular opening I5, the point 22 being on the radius 23 of the disc which passes through the center of the circular opening and substantially bisects vhe slit I 4. Otherwise expressed, the depth of each slit I6 is equal to the distance between the inner end of the slot I4 and the center of the coacting circular opening plus the radius of the opening. The outer end of the slit I6, between the points I9 and 24, is constricted as shown in Figure 4 for a distance substantially equal to the diameter of th circular opening so that the depth of the slit l6 between the points 20 and 24 (Fig. 4) is substantially equal to the distance between the points 2| and 25 (Fig. 3) on the disc.

The operation in forming the impeller I is as follows:

The disc H with the radially directed slots l4 and coacting central openings I5 is die stamped from a sheet of suitable material. While not essential, the blades l2 can also be stamped from the sheet along with the disc in order to save both tim and material and the only prerequisite for which is the proper die which has been constructed by applicant. During the stamping operation, each blade has a slit l6 formed therein, the dimensions and shape of which have been previously described. With .the plane of a blade reasonably perpendicular to the plane of the disc, the slit I6 is fitted into one of the slots [4 until the constricted outer end of the slit [6, between the points l9 and 24, is over the coacting circular opening 15 of the disc, the diameter of the opening [5 being approximately equal to the length of the constricted portion of the slit l6, that is between the .points l9 and 24. By squeezing together the opposite edges of the slitted portions of the blade so assembled, the opposed edges of said portions are forced into and locked in the opening 15. The squeezing operation alone, however, would tend to move the plane of the blade [2 out of the desired perpendicular position relative to the plane of the .disc H. However, by raising a concentric ring I! in the disc Ii adjacent the inner ends of'the blades, it has been found possible to maintain the plane of each blade substantially perpendicular to the plane of the disc.

With the impeller thus formed and with a coacting housing (not shown) in which the impeller is inserted to rotate in the direction of the desired flow of the water connected in the pipe line of the water system a simple, efiective, and eflicient device has been created.

It will be understood that the invention is not limited to the exact disclosure herein described but may lend itself to a variety of expressions within the scope of the appended claim.

and circular opening, each blade having a length substantially equal to the distance between the center of the circular opening and the periphery of the disc .plus the radius of the opening as measured on the radius of the disc bisecting the slot, each blade further having a thickness substantially equal to the width of the slots and being divided into two substantially equal parts by a slit formed in one edge, the outer portion of the slit being constricted relative to the inner portion for a distance substantially equal 'to the diameter of the circular opening, the slit further having a depth substantially equal to'the distance between the end of the slot and the center of the circular opening plus the radius of said opening as measured on the radius of the disc bisecting the slot, the disc further having a ring formed therein, the ring being concentric with and inwardly spaced from the circular openings.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 1,005,572 Parkerson Oct. 10, 1911 1,015,552 Gamon Jan. 23, 1912 1,877,347 McMurdie Sept. 13, 1932 1,919,970 Woods July 25, 1933 1,961,228 Knox June 5, 1934 2,257,867 Thrush Oct. 7, 1941 2,350,739 Ferre June 6, 1944 2,436,911 Zeidler Mar. 2, 1948 

